Tool-post



(No Model.)

A. NEWELL.

TOOL POST.

No. 446,462. Patented Feb. 17,1891.

Ai ylT'E AUGUSTUS NEWELIJ, OF CHICAGO, ILLINOIS.

TOOL- POST.

SPECIFICATION forming part of Letters Patent No. 446,462, dated February 17, 1891.

Application filed May 17, 1890.

v To all whom it may concern.-

Be it known that I, AUGUSTUS NnwELL, a citizen of the United States residing at Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Tool-Posts; and I do hereby declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawin gs, and to letters of reference marked thereon, which form a part of this specification.

This invention relates particularly to toolposts for lathes and similar machines, and has for its object to provide a tool-post having combined with it means for more thoroughly securing it in the post-block and for preventing injury to the engaging portions of said post and block.

In the accompanying drawings, Figure 1 is a detail View showing the foot by which the ordinary tool-post is secured within the postblock. Fig. 2 is a Vertical section of a toolpost embodying my improvement and secured in a post-block shown endwise. Fig. 3 is an elevation of my improved tool-post and the foot-block applied thereto. Fig. 4 is a bottom View of the removable foot of my improved post. Fig. 5 is a plan of the foot-block detached from the post.

A is the post-block, having the channel A, provided at its upper portion with the flanges A extending toward each other from the sides of said channel. Said block is well known in the art, and it is therefore deemed unnecessary to describe the same.

Bis the tool-post. At the middle of said post is a vertical slot B, through which extends the tool 13 and B is a set-bolt extending downward through the upper portion of the post into said slot and upon the upper side of the tool These portions are not changed in my improvement. In the ordinary post the portion below the slot 13 terminates in a cylindric neck B, at the lower end of which is a circular foot consisting of a flange extending outward uniformly from said neck beneath the flanges A? A 0 is the ordinary ringlying upon the block A around the post B beneath the tool B and supporting the latter. In driving the set-bolt Serial No. 352,226. (No model.)

B downward the post B is forced upward, so that the upper edge of the foot is drawn against the flanges A A Thus the post and the ring O are bound to said block. Only a small portion of each side of the foot B is engaged with the flanges A A The entire strain is therefore upon a limited portion of said foot and upon a limited portion of said flanges. The strain, being thus concentrated, is intensified to such an extent as to dent and chip the material and destroy the straight faces of said flanges and said foot. Then the post is with difficulty held rigidly, and when it is shifted longitudinally in said channel the upright position cannot be maintained. In many cases so much of the foot is broken and worn off that the post cannot be further used.

-By an inspection of Fig. 1 it will be seen that there are four recesses or tapering spaces within the channel A between the sides of the foot B and the vertical walls of said channel, into which dirt and chips from the machine may lodge'and wedge to interfere with the horizontal shifting of the post. To obviate these difficulties I have combined with the neck and foot of the postafootblock, which surrounds said foot and neck and fills such a considerable portion of the channel A as to furnish ample bearingsurface to give the required strength to the apparatus and to prevent the injury done to the parts by concentration of this strain. Furthermore, the shape of said foot-block is such as to avoid converging recesses in which dirt and chips may lodge and wedge. In the drawings the-foot and neck are both smaller than the channel A, and the foot is lower down in the channel than is the case in the ordinary construction.

D is the foot block. This is of such dimensions as to fill the channel A transversely, and is of sufficient length .to provide the desired bearing-surface to make contact with the faces of the channel A. To make room for the foot a recess D is formed in the lower face of the block D. In surrounding said foot said block bears against the side and upper faces of the entire circumference of said foot, as well as against the entire circumference of the face of said neck. Thus the strain between the foot and the foot-block and between the foot-block and the post-block is distributed over a large extent of surface, and if the said parts are made true the post will stand very firmly at any point within the channel A, and will always stand accurately perpendicularly with reference to the face of the post-block. In drawing the set-bolt B the foot B is drawn against the foot-block D, and said block is drawn upward against the flanges A A The foot 13 1s separable from the neck B and threaded to the lower portion of said neck after said foot-block has been placed upon said neck. As said foot is to set wholly within said foot-block, so that the faces of the two will be flush with each other,provision forengagement with awrench maybe made by forming in the lower face of said foot-wrench sockets b.

I claim as my invention 1. The combination, with a tool-post having a neck 13, of a foot-block surrounding said neck and of proper dimensions to fit into the channel of the post-block of a lathe or similar machine and having in its lower portion a recess, and a separable foot applied to the lower portion of said neck within said foot-block, substantially as shown and described.

2. The combination, with a tool-post having a neck B, of a foot-block surrounding saidneck and of proper dimensions to fitinto the channel of the post-block of a lathe or similar machine and having in its lower portion a recess, and a foot threaded to the lower portion of said neck within said foot-block, said foot having in its lower face wrenchsockets b substantially as shown and described.

53. The combination, with a tool-post having a neck 15*, of a foot-block surrounding said neck and having an upward extension and being of proper dimensions to fit into and fill transversely the channel of the post-block of a lathe or similar machine and having in its lower portion a recess, and a separable foot applied to the lower portion of said neck within said foot-block, substantially as shown and described.

4. The combination, with a tool-post having a neck 13, and a foot-block surrounding said neck and having an upward extension and being of proper dimensions to fit into and transversely fill the ehannelof a post-block of a lathe or similar machine, and having in its lower portion a recess, and a foot threaded to the lower portion of said neck within said foot-block, said foot having in its lower face wrench-sockets 0 substantially as shown and described.

In testimon y whereof I affix my signature, in presence of two witnesses, this 1st dayof May, in the year 1890.

AUGUSTUS NE\VELL.

- Witnesses: ALBERT W. BARNUM, CYRUS KEHR. 

